Definitions from Wiktionary (Brain)

▸ noun:  The control center of the central nervous system of an animal located in the skull which is responsible for perception, cognition, attention, memory, emotion, and action.
▸ noun:  A part of the brain, especially associated with particular mental functions, abilities, etc.
▸ noun:  (informal) Mind.
▸ noun:  (in the plural) Intellect.
▸ noun:  (informal) An intelligent person.
▸ noun:  (plural only) A person who provides the intelligence required for something.
▸ noun:  (in the singular) An intellectual or mental capacity.
▸ noun:  By analogy with a human brain, the part of a machine or computer that performs calculations.
▸ noun:  (slang, vulgar, uncountable) Oral sex.
▸ noun:  A loose compartment of a backpack that straps on over the top opening.
▸ verb:  (transitive) To dash out the brains of; to kill by smashing the skull.
▸ verb:  (transitive, slang) To strike (someone) on the head.
▸ verb:  (transitive, figurative) To destroy; to put an end to.
▸ verb:  (transitive, obsolete) To conceive in the mind; to understand.
▸ noun:  A surname.

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